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Urban Farm Magazine

American Mammoth Jackstock Donkeys

American Mammoth Jackstock Livestock

Use of American Mammoth Jackstock Donkeys:  The Mammoth Jack’s main purpose is to produce mules for various uses. The lighter Jacks are often used to create saddle mules, while heavier boned Jacks are used for draft mules. Mammoth Jacks are also ridden and can easily carry a rider. The breed is also shown in a variety of classes at donkey shows, including donkey pleasure and harness. They also make good trail mounts.

Courtesy Birkenholz Stock Farm

American Mammoth Jackstock Breed Profile


History of American Mammoth Jackstock Donkeys:  The American Mammoth Jackstock was developed in the United States by cross-breeding of large European donkeys with American and Mexican stock. These donkeys were initially bred before the Revolutionary War. They became valuable for their ability to sire mules with size, strength and vitality for use in agriculture and transportation. George Washington received an Andalusian jack and two jennets from the King of Spain in 1785, marking the beginning of good fortune for the Mammoth Jack. These quality donkeys became the foundation stock for the modern Mammoth Jack breed. Types arose within the Mammoth Jack breed as a result of the different kinds of mules needed in various areas of the country. Other circumstances also influenced regional type when it came to Mammath Jacks. The result is that several different types of Mammoth Jacks can be seen today.

Conformation:  In order to be registered with the American Mammoth Jackstock Registry, Mammoth Jacks must stand 14.2 hands or higher at the withers, while jennets can be 14 hands or higher. The tallest known Mammoth stood 17 hands. Mammoth Jacks typically weigh from 1,000 to 2,000 pounds. Mammoth Jacks should be well proportioned and have good bone. They have large heads and well-muscled necks, and a strong loin and full hips. They come in black, sorrel, roan, dun and spotted.

Special Consideration/Notes on American Mammoth Jackstock Donkeys:  Mammoth Jacks are listed as “threatened” by the American Livestock Breed Conservancy. Males are rarely gelded because of the animal’s value as breeding stock.


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